Tooth for the cylinders of thrashing-machines



(ModeL) W. H. BUTTERWORTH & J. BUTTERWORTH, TOOTH FOR THE CYLINDERS 0FTHRASHING MACHINES.

No. 415,136. Patented Nov. 12, 1889.

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UNITED STATES PATENT ()FFICE,

VILLIAM H. BUTTERVVORTH AND JOHN BUTTERWORTH, JR, OF TRENTON,

NEW JERSEY.

TOOTH FOR THE CYLINDERS; OF THRA SHlNG-MAQHINES.

' SPECIFICATION forming part of Letters Patent No. 415,136, datedNovember 12,1889.

Application filed May 23, 1889. Serial No. 311,776. (ModeL) To all whomit may concern:

Be it known that we, WILLIAM H. BUTTER- wonrn and JOHN BUTTERWORTH, Jr., citizens of the United States, residing at Trenton, in the county ofMercer and State of New J ersey, have invented certain new and usefulImprovements in Teeth forthe Cylinders of Thrashing-Machines; and we dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

Our invention relates to improvements in spikes or teeth for thecylinders of thrashingmachines, the object being to provide teeth whichshall be accurately or perfectly fitted or seated in the openings in thecylinder-bars, which shall always be held in an upright position, andwhich shall be able to withstand thesevere strains to which they arealways subjected during the operation of thrashing.

As now ordinarily constructed, thrasherteeth are provided withnearly-square shoulders intermediate of the blades and shanks; but owingto inherent faults of manufacture they have a slight taper, whichresults in imperfect seating in the cylinder-bars; besides, as theflanges of said shoulders are small and only on the concaved sides ofthe teeth, the latter, when screwed tightly in the openings in the bars,are drawn downward, which often results in curving their cylindricalscrewthreaded shanks; also, as the full force of the power applied fordoing the thrashing comes almost wholly upon the convex sides of theteeth, immense strain is produced upon their shanks, binding-nuts, andflanges, which in a short time causes said binding nuts to become loose,work off the shanks, and permit the teeth to be shot or violently thrownout of the cylinder by centrifugal force, thus endangering the lives ofthe workmen and often seriously damaging or injuring the machine.

Our invention is designed to remedy these and other defects; and itconsists, first, of a thrasher-tooth composed of a blade, ascrewthreaded shank for receiving a binding-nut, and a conical seathaving a series of planoconical shoulders arranged intermediate of saidshank and blade, and adapted to fit in corresponding recesses formed inthe walls of the opening in the cylinder-bar; second, of athrasher-tooth composed of a blade, a screwthreaded shank for receivingabinding-nut, and a conical seat having one or more angular corners orprojections, and also a series of piano-conical shoulders arrangedintermediate of said blade and shank, and adapted to arrangement orcombinations of parts, as will be hereinafter fully described, and thendefinitely pointed out in the claims.

In the accompanying drawings, forming part of this specification, inwhich the same reference-numerals designate the same or correspondingparts, Figure 1 represents a side elevation of a thrasher-toothconstructed accordin g to our invention and applied to a cyl inder-bar,the latter andthe binding-nut being shown in section; Fig. 2, a rear endview of said tooth; Fig. 3, a sectional view of the cylinder-bar throughthe opening; and Figs. at, 5, 6, 7, and 8, rear end views of modifiedforms of said tooth.

Referring to Figs. 1, 2, and 3 of the drawings, which show our preferredconstruction of thrasher-tooth, the reference-11 u meral 1 designatesthe blade of said tooth, which is substantially the same as in theordinary construction, 2 the screw-threaded shank for receiving thebinding-nut 3, and 4 the conical seat having four, plano-conicalshoulders 4, which fit in corresponding recesses formed in the walls ofthe opening in the cylinder-bar. The conical seat 4, intermediate of theshank and blade of the tooth, is formed along its rear end with asquared portion 5, which has four corners or angular projections 6. Thissquared portion fits into a correspondinglyshaped aperture formed in therear portion which is formed with a number of openings the toothprovided with the conical seat hava corresponding to the number of teethto be employed. the bar and made of suiiicient diameter to allow thecylindrical screw-threaded shank of the tooth to pass looselytherethrough. The bar is then countersunk around this opening with adrill shaped to perfectly correspond to the conical portion or seat 4 ofthe tooth and to the plano-conical shoulders it formed thereon, and thenthe walls of said opening are punched to correspond to the corners orangular projections 6 of the tooth. In casea tooth is to be employedhaving corners or proj ections diifercnt in shape from those shown inFigs. 1 and 2, a corresponding punch is used for forming the recesses intherwalls of the openings.

Figs. 4, 5, G, 7, and 8 show modifications in the form of the tooth,which consist-s simply in the number and shape of the corners or angularprojections (3, which prevent said tooth from turning in the opening inthebar. In Figs. 4, 5, and 7 are shown three, two, and one,respectively, of these corners or projections, which are substantiallytriangular in shape, but any desired or suit-able number of them may beemployed; also, in Figs. 6 and S are shown two and one, respectively, ofthese corners or projections having substantially rectangularshape; buttheirshape or configuration may be different. In all of thesemodifications the principle of the invention is not departed from, whichconsists, essentially, of

iug the plano-conical shoulders adapted to fit in acorrespondingly-shaped opening formed in the cylinder-bar.

It is obvious that the corners or projections 6 of the tooth can be madeto extend forward beyond the largest circumferential limit of theconical seat 4; but we prefer to make them so that they will not soextend, since without this a ncater finish will result when the tooth isin the opening in the bar, as no recesses or slots will appear in theopening for said corners or projections. On the other hand, if saidcorners be made to project forward beyond the largest circumferentiallimit of said conical seat, said recesses or slots will not be coveredby said conical seat, but will always appear unsightly when the tooth isin position in the bar; also, under this latter construction therecesses or slots have a greater tendency to weaken the bar, as thedistance from the center of the tooth to the Each opening is drilledthrough outsides of said recesses or slots is greater than it is whenthey do not extend beyond the largest circumferential limit of theconical seat. However, we regard either of these constructions andarrangements of parts and features as equally within the scope of ourinvent-ion.

By our invention, owing to the conicallyshaped seats of the teeth havingthe planoconical shoulders and the perfect manner in which they fit inthe eorrespondingly-shaped openings in the cylinder-bars, the seriousand dangerous features which have always existed in this class ofdevices and been a source of anxiety to both manufacturers and users ofthrashing-machines, arising from the liability of the teeth to workloose and fly out of the cylinders, arewholly obviated.

While the foregoing description of our in- ;vention only refers to theteeth as being improved for the cylinders of thrashing-machines, theyare nevertheless equally improved for and applicable to the eoncavesofthrashing-machines, and therefore either use thereof is equally withinthe scope of our invention.

In order to apply these teeth to cast-iron concaves, it is onlynecessary to cast the. holes in the latter to correspond to the shape ofthe tures of our invention, the combinationsbased thereon, itsoperation, and advantages, what we claim as new is 1. A thrasher-toothprovided with a blade, a screw-threaded shank, and a conical seat havinga series of piano-conical shoulders arranged intermediate of said bladeand shank, substantially as described.

2. A thrasher-tooth provided with a blade, a screw-threaded shank, and aconical seat formed with one or more angles, and a series ofplano-conical shoulders arranged intermediate of said blade and shank,substantially as described.

3. A thrasher-tooth provided witha blade, a screw-threaded shank, and aconical seat having a squared portion with four corners along its rearend, and a plane-conical shoulder on each of the faces of said squaredportion, substantially as described.

4:. A thrasher-tooth provided with a blade, a screw-threaded shank, anda conical seat having a squared portion with corners or projections,which are arranged so as to not extend forward beyond the largestcircumferential limit of said conical seat, substantially as and for thepurpose described.

5. The combination, with a thrasher-tooth provided with a blade, ascrewthreaded shank, and a conical seat having a series of plane-conicalshoulders and one or more cor- IIO ners or projections, of acylinder-bar formed with an opening corresponding in form or' shape tosaid conical seat and its features, and a binding-nut fitted upon saidscrewthreaded shank, substantially as described.

6. The combination, with a thrasher-tooth provided with a blade, ascrew-threaded shank, and a conical seat having one or more angularcorners or projections and a series of plano-conical shoulders, of acylinder-bar formed with an opening for receiving said conical seat andit's angular projections and plane-conical shoulders, and a binding-nutfitted upon said screw-threaded shank, substantially as described.

In testimony whereof we affix our signatures in presence of twoWitnesses.

WILLIAM H. BUTTERWORTH. JOHN BUTTERWORTH, JR. NVitnesses:

E. F. DIGNAN, J. W. DIGNAN.

